At the height of the Occupy Wall Street evictions, it seemed as though some diminutive version of “shock and awe” had stumbled from Baghdad, Iraq, to Oakland, Calif. American police forces had been “militarized,” many commentators worried, as though the firepower and callous tactics on display were anomalies, surprises bursting upon us from nowhere.

There should have been no surprise. Those flash grenades exploding in Oakland and the sound cannons on New York’s streets simply opened small windows onto a national policing landscape long in the process of militarization — a bleak domestic no man’s land marked by tanks and drones, robot bomb detectors, grenade launchers, tasers, and most of all, interlinked video surveillance cameras and information databases growing quietly on unobtrusive server farms everywhere.